Hello leeravens,
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beeceebee: no sound thread
'before you do anything else please go into your control panel and click on "sounds and audio devices." Select the audios tab and make certain that the realtek device is listed as the default.
Plastic Nev: no sound thread
'While still in device manager, a right click on the AC97 should come up with "Update driver", provided you are connected to the web or online, windows will search for and install the missing driver, without looking for other drivers.'
beeceebee: no sound thread
1. Go back to your device manager and delete the realtek AUDIO device completely. After you have done that shut down and reboot the computer. Hopefully it will recognise the sound device and install it with drivers.'
Hope any of this helps.
Please visit this website, you might find the driver that you need